On a rainy night in London, Mio Kujo accidentally entered a mysterious lost property shop in the thick fog.
What is collected in the store is not ordinary objects, but the wishes, courage, promises, apologies and unspoken love left behind by the world. Those lost objects that have not been responded to for a long time will decay over time and eventually turn into existences called "monsters".
The owner of the lost object shop, Kamishiro Sakuya, is a magician who has lived for more than a thousand years.
Thousands of years ago, he was an ordinary boy in a distant magical village. In order to quell an ancient disaster, he signed a contract with the gods and became the owner of a lost property shop, spending many years alone.
This is a gothic story about lost objects, magic, listening and belonging.
It is also the story of many lost people who were tenderly returned.
Purpose: Using "return of lost things" as a fantasy shell, it describes how people can be listened to and understood again, and find the destination of their souls after loneliness, forgetfulness and loss.